Biphenyl derivative photoinitiator as well as preparation method and application thereof

The invention relates to a biphenyl derivative photoinitiator and a preparation method and application thereof.The photoinitiator takes substituted or unsubstituted biphenyl as a core, aminoketone active groups are connected to benzene rings on the two sides to serve as chromophores, and compared with a photoinitiator 369, the biphenyl derivative photoinitiator has high photocuring activity and can be used as a photoinitiator. The migration rate in a light-cured coating is low, and the solubility in a resin monomer is relatively good; according to the synthesis method of the photoinitiator, the 2-dimethylamino-1-(4-morpholinobenzylphenyl) butanone and the substituted or unsubstituted bibenzyl halide biphenyl are used as raw materials, the target photoinitiator is obtained through salification and rearrangement reactions, the synthesis method is simple, the yield and purity of the target product are high, and industrial application is facilitated. 本发明涉及一种联苯衍生物光引发剂及其制备方法和应用，所述光引发剂以取代或未取代的联苯为核心，两侧苯环上连接氨基酮类活性基团作为